{"cve":"CVE-2026-82399","nvd":{"published":"2026-09-16T19:17:44.627","modified":"2026-09-24T21:16:28.120","status":"Awaiting Analysis","description":"CoreDNS is a DNS server written in Go. Prior to 1.14.7, the DNS-over-HTTPS, DNS-over-HTTP/3, DNS-over-QUIC, and DNS-over-gRPC request paths in plugin/pkg/doh/doh.go, core/dnsserver/server_quic.go, and core/dnsserver/server_grpc.go call dns.Msg.Unpack on attacker-controlled DNS section counts before dns.DefaultMsgAcceptFunc validates the fixed header. An unauthenticated client can use DNS name compression and excessive section counts to amplify allocation before the plugin chain, so plugin-level rate limiting cannot prevent concurrent requests from exhausting memory and terminating CoreDNS. The ordinary UDP and TCP listeners are not affected because they validate the header first. This issue is fixed in version 1.14.7.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-770"],"references":["https://github.com/coredns/coredns/commit/530b0a5ff2ad68cc0421f10dd93568945cc671c9","https://github.com/coredns/coredns/releases/tag/v1.14.7","https://github.com/coredns/coredns/security/advisories/GHSA-mrg3-qvqr-jw29","https://github.com/coredns/coredns/security/advisories/GHSA-mrg3-qvqr-jw29"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:54:41.405518556+00:00"},"epss":{"cve":"CVE-2026-82399","score":0.00609,"percentile":0.49186,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-mrg3-qvqr-jw29","url":"https://osv.dev/vulnerability/GHSA-mrg3-qvqr-jw29","summary":"CoreDNS: Unauthenticated memory exhaustion in custom transports","modified":"2026-09-28T17:10:57.533111718Z","packages":[{"ecosystem":"Go","name":"github.com/coredns/coredns","purl":"pkg:golang/github.com/coredns/coredns","ranges":["<1.14.7"],"fixed":["1.14.7"]}]},{"id":"GO-2026-6507","url":"https://osv.dev/vulnerability/GO-2026-6507","summary":"CoreDNS: Unauthenticated memory exhaustion in custom transports in github.com/coredns/coredns","modified":"2026-09-28T17:00:17.015433535Z","packages":[{"ecosystem":"Go","name":"github.com/coredns/coredns","purl":"pkg:golang/github.com/coredns/coredns","ranges":["<1.14.7"],"fixed":["1.14.7"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}